There are many kinds of common cornfield herbicides. For the farmer's uncle, how to choose the most suitable herbicide in many cornfield herbicides. The Chinese pesticide nets have sorted out the common cornfield herbicides on the market as follows:
1, oxaconazole (defend)
Characteristics of the drug: Indirect effects on the synthesis of carotenoids, in the sun, affect the synthesis and function of chlorophyll, leading to severe whitening of weeds and tissue necrosis. It is safe for corn and safe for sweet corn and waxy corn.
Techniques for use: 2-4 leaf stage after corn seedlings, 2-5 leaf stage application of annual weeds. It can effectively prevent annual single and double cotyled weeds, such as valerian, crabgrass, foxtail, medlar, purslane, nightshade, medlar, ramie, leeks, hot pepper, iron leeks, leeks, bowls, Saving and so on. It has a good compatibility with atrazine, and the addition of atrazine can increase the activity on grass and comfrey, and increase the speed of action. Hybrid corn weeding 5ml per mu of oxaconazole + 70g 90% atrazine + special additives, sweet, waxy corn weeding 10ml of oxaconazole per acre + special additives.
Note: Use as much as possible after dilution, avoid mixing with organophosphorus pesticides, and use drugs at intervals of 7 days or more. Poor effect on fragrant aconite, only inhibition.
2. Isoxaflutole
Isoxazinone is an isoxazole herbicide and is a selective herbicide for HPPD inhibitors invented by Bayer. It has soil activity and early stem and leaf herbicidal activity, prevents carotenoid biosynthesis and leads to sensitive plants. Chlorophyll destruction, plant yellowing and death. It can effectively control broadleaf and grass weeds, such as ramie, ragweed, cockroach, cockroach, terracotta, cockroach and wild cockroach, valerian, and foxtail. Isoxaflutole should be applied as early as 1 week after corn sowing. In order to better control grass weeds, it is especially recommended to mix isoxaflutole with amide herbicides such as acetochlor and propisochlor. In addition to mixing, there are few plots of grass weeds that can be used alone.
3. Thiolsulfuron-methyl
Thiazolone is a sulfonylaminocarbonyltriazolinone (SCT) herbicide and is a new class of ALS inhibitors invented by Bayer. It has soil activity and stem and leaf herbicidal activity. After application, the active ingredient passes through sensitive plant roots. After the stems and leaves are absorbed into the plants, the biosynthesis of the branched chain amino acids is prevented, and eventually the sensitive plants are killed. Thiazolone is effective in controlling grass weeds and broadleaf weeds in corn fields, showing a good balance between foliar application and residual action. The active ingredient can effectively prevent ramie and many carnation weeds, and can be used before and during the early post-emergence period. Bayer pointed out that thiazsulfuron can effectively control corn field weeds at a dose of 8g (ai) / ha, however, the company's recommended dosage for the development of this product is: post-emergence application, the dose will increase to 15g (ai) /ha; The pre-emergence dose will be 37g (ai) / ha.
4, 315g / L isoxaflutole ketone sulfonate suspending agent (including corn safener cyprosulfamide) (Bayer love Yuyou)
In the early stage of post-emergence or early post-emergence (before the 3-leaf stage), the active ingredient is 7.9-9.5g per acre, and the spray is applied evenly to the water, and the tendon grass, crabgrass, foxtail, valerian, wild pheasant, The control effects of anti-branches, purslane, ramie, cocklebur, and cockroaches are about 95%, and the control effect on leeks is about 80%. Corn and sorghum wheat, barley, soybeans, potatoes, canola, spinach, garlic, etc. are safe in the test dose range.
Use technology: (1) Ai Yuyou single use 50-60ml / mu; (2) Ai Yuyou 30 ml + Atrazine 100-150ml / mu (recommended)
5. Chloroylphosphonium
Developed by China Central China Normal University, it is a hormone herbicide with systemic conductivity and its mechanism of action is pyruvate dehydrogenase inhibitor. It is a substituted phenoxyacetoxyalkylphosphonate compound with novel structure and low toxicity. It has been proved by biochemical research to be a strong inhibitor of pyruvate dehydrogenase system, which can effectively prevent broad-leaved hybrids of corn. Grass and some monocotyledon weeds. The digestion rate in corn and soil is fast and easy to degrade. The half-life of both soil and fresh plants is less than 0.4 days, which has no effect on the later crops. Chloroylphosphine has a fast-acting effect and has a fast effect on weeds. The weeds show symptoms of wilting after 7 days of application, and most of the weeds have died 15 days after application. For iron leeks, amaranth, scorpion, ramie, tongquan grass, corn grass, corn grass, head flower bud, flat storage, broadleaf weeds, and dogtail, thousand gold, broken rice sedge, shaped sand Grass, leeches and other sedge weeds have excellent control effects, and the total control effect can reach more than 90%.
6, fluoxazine
The pyridazinone herbicide developed by Sumitomo Chemical of Japan in recent years is a protoporphyrinogen oxidase inhibitor used to control broadleaf weeds after corn seedlings, and weeds appear necrotic symptoms several hours after treatment.
7, oxazolone
Triazolinone herbicides, which are potential photosynthesis electron transport inhibitors, can be used for pre-maize soil treatment, and have excellent control effects against castor, medlar, wild pheasant, Xanthium and sweet potato, especially effective Control most weeds that are resistant to PSII inhibitors. The application rate was 33 g/mu, and it was sprayed with water at 30 kg/mu.
8, flusulfuron-methyl
Selectively transporting herbicides are mainly absorbed by the roots, stems and leaves of weeds and are transmitted in the body. By inhibiting the biosynthesis of the essential amino acids proline and isoleucine, cell division and plant growth are prevented, and the shoots and roots are stopped from growing, thereby killing the whole plant. The efficacy of the drug is relatively slow, and the drug stops growing immediately, but it will die after 10-20 days. Mainly used in cornfields to control annual or perennial grasses and broadleaf weeds, such as valerian, foxtail, broken sedge, leeches, fragrant aconite, green carp, bluegrass, leeks, and sorghum.
9. Fluothithine
1. An imide herbicide, a protoporphyrinogen oxidase inhibitor. It acts rapidly on the surface of sensitive weeds, causing the accumulation of protoporphyrin and enhancing the lipid peroxidation of cell membrane. This leads to irreversible damage to the cell membrane structure and cell function of sensitive weeds. Freckle symptoms often appear 24-48h. A post-emergence herbicide for corn fields. It is mainly used to control broad-leaved weeds in corn fields, especially for some broad-leaved weeds that are difficult to control. For example, 2.5-10g(ai)/ha is related to Xanthium, ramie, Xifeng ancient, alfalfa and cracked leaves. It has excellent activity in cattle, round-leaf morning glory, big horse scorpion, purslane, and big fruit. In 10g(ai)/ha, it is also very active against the genus, mandolin, thorns, sylvestris, and geranium. It is treated with stems and leaves at a dose of 5-10g(ai)/ha. It has excellent activity against deciduous, broad-leaved weeds such as ramie, zephyr and scorpion in different growth stages (2-51cm high), and its activity is better than Acifluorfen, chlorsulfuron, imazethapyr, bentazone, thiasulfuron.
10. Cyclohexanone
Cyclohexanone is a new herbicide herbicide developed by Bayer in 2007. Its activity is higher than that of mesotrione (mesulone, mesotrione), which is safe for crops. In early 2007, the product was approved for registration in Austria, which is the first time it has been registered globally. Introduced in 2008, the trade name is Ludis, which is composed of cyclosulphonone and the safener dibenzoxazole acid. Corn can metabolize sulfonate. This preparation protects corn from UV damage and has a broad spectrum and fast acting characteristics. And highly compatible with the environment. The dosage form is oil dispersing agent, which is used for the treatment of corn stems and leaves. The dosage is 1.5g/ha, which can prevent broadleaf and grass weeds, and fight against cockroaches, field convolvulus, mother-in-law, hot pepper, stalk flower and piglet. Excellent effect. Sold in Chile in 2010.
11. Aminocyclopyrimidine
The new herbicide reported by DuPont is the first pyrimidine carboxylic acid herbicide with a chemical structure similar to that of pyridine herbicides such as clopyralid, clopyralid, flufenoxyacetic acid. The sensitivity to broadleaf plants is consistent with synthetic hormone herbicides. Mechanism of action: Hormone herbicides of aminocyclopyrimidine biosynthesis, mode of action: foliar application, with systemic activity, absorbed through the leaves, stems, roots to the xylem and phloem, weeds need several weeks or several Month, the effect is significant. Its methyl ester derivatives can control broadleaf weeds, including many species of weeds and some woody species such as Compositae, Dimorphaceae, Leguminosae, Polygonaceae, Polygonaceae, Convolvulaceae, Solanaceae, Euphorbiaceae. Plants and several anti-ALS, triazine, glyphosate weeds, aminocyclidines are used in low doses, can be mixed with sulfonylurea herbicides to increase the control range of weeds, and their activity is much higher than other hormones weeding The variety of the agent, after application, the dosage is 150-200g/ha.
12. Metotriamide
The new herbicides of triazolinones developed and produced by FMC in the United States, the contact-type stem and leaf treatment agents, especially the weeds resistant to sulfonylureas, have special effects, and the crops are safe and killing grass. Wide, low dosage, fast killing grass. It is suitable for broad-leaved weeds such as cornfield anti-poor, ramie, anti-twig, earthworm, earth skin, piglet, nightshade, white mustard, wild sesame, and red heart. It is safe for the crops, but it has certain phytotoxicity to cotton and sugar beets.
13, saflufenacil
A uracil herbicide produced by BASF is a protoporphyrinogen oxidase inhibitor. The first PPO inhibitor used in corn pre-emergence, with a pre-treatment dose of 63-125 g/ha in corn, can quickly eradicate and control more than 70 broad-leaved weeds, including atrazine, glyphosate and ALS inhibitors. Weeds. It is effective against weeds of broad-leaf weeds such as alfalfa and alfalfa and refractory large-sized seeds such as sunflower, ramie and morning glory weeds.
14, acetochlor
Italamine is a new type of high-efficiency herbicide for corn field, and the dosage is 1.0-2.4kg(ai)/ha. It not only has high control effect on grass weeds, crabgrass, and foxtail, but also on broad-leaved weeds such as amaranth, scorpion, purslane, snail, sylvestris, peach aphid, and stalk And Dijin also has good control effect. In order to increase the control effect, it is recommended to mix with other herbicides such as atrazine, tebutin and weeding. Corn fields can be used before or after crops. The duration of acetochlor is about 8-10 weeks due to differences in soil moisture. Since no significant residue was found in the field trials, it was used as recommended and no time interval was required before spraying and planting the crop.
After knowing the common cornfield herbicides, it is not difficult to choose a herbicide.
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